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<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtquick-index.html">Qt Quick 模块</a></td><td ><a href="qtquick-qmlmodule.html">QML类型</a></td><td >Rotation QML 类型</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">目录</a></h3>
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<li class="level1"><a href="#properties">属性</a></li>
<li class="level1"><a href="#details">详细信息</a></li>
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<h1 class="title">Rotation QML 类型</h1>
<span class="subtitle"></span>
<!-- $$$Rotation-brief -->
<p>Provides a way to rotate an Item. <a href="#details">更多...</a></p>
<!-- @@@Rotation -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> 导入语句：</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr></table></div><ul>
<li><a href="qml-qtquick-rotation-members.html">所有成员的列表，包括继承成员</a></li>
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<a name="properties"></a>
<h2 id="properties">属性</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#angle-prop">angle</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis-prop">axis</a></b></b><ul>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis.x-prop">axis.x</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis.y-prop">axis.y</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis.z-prop">axis.z</a></b></b> : real</li>
</ul>
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<li class="fn"><b><b><a href="qml-qtquick-rotation.html#origin-prop">origin</a></b></b><ul>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#origin.x-prop">origin.x</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#origin.y-prop">origin.y</a></b></b> : real</li>
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<!-- $$$Rotation-description -->
<a name="details"></a>
<h2 id="details">详细信息</h2>
<p>The Rotation type provides a way to rotate an <a href="qml-qtquick-item.html">Item</a> through a rotation-type transform.</p>
<p>It allows (z axis) rotation to be relative to an arbitrary point, and also provides a way to specify 3D-like rotations for Items. This gives more control over item rotation than the <a href="qml-qtquick-item.html#rotation-prop">rotation</a> property.</p>
<p>The following example rotates a Rectangle around its interior point (25, 25):</p>
<pre class="qml">

  <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
      <span class="name">width</span>: <span class="number">100</span>; <span class="name">height</span>: <span class="number">100</span>
      <span class="name">color</span>: <span class="string">&quot;blue&quot;</span>
      <span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">25</span>; <span class="name">origin</span>.y: <span class="number">25</span>; <span class="name">angle</span>: <span class="number">45</span>}
  }

</pre>
<p>For 3D-like item rotations, you must specify the axis of rotation in addition to the origin point. The following example shows various 3D-like rotations applied to an <a href="qml-qtquick-image.html">Image</a>.</p>
<pre class="qml">

  import QtQuick 2.0

  <span class="type"><a href="qml-qtquick-row.html">Row</a></span> {
      <span class="name">x</span>: <span class="number">10</span>; <span class="name">y</span>: <span class="number">10</span>
      <span class="name">spacing</span>: <span class="number">10</span>

      <span class="type"><a href="qml-qtquick-image.html">Image</a></span> { <span class="name">source</span>: <span class="string">&quot;pics/qt.png&quot;</span> }
      <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
          <span class="name">source</span>: <span class="string">&quot;pics/qt.png&quot;</span>
          <span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">18</span> }
      }
      <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
          <span class="name">source</span>: <span class="string">&quot;pics/qt.png&quot;</span>
          <span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">36</span> }
      }
      <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
          <span class="name">source</span>: <span class="string">&quot;pics/qt.png&quot;</span>
          <span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">54</span> }
      }
      <span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
          <span class="name">source</span>: <span class="string">&quot;pics/qt.png&quot;</span>
          <span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">72</span> }
      }
  }

</pre>
<p class="centerAlign"><img src="images/axisrotation.png" alt="" /></p><p><b>See also </b><a href="qtquick-customitems-dialcontrol-example.html">Dial Control example</a> and <a href="../qtdoc/qtdoc-demos-clocks-example.html">Qt Quick Demo - Clocks</a>.</p>
<!-- @@@Rotation -->
<h2>属性文档</h2>
<!-- $$$angle -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="angle-prop">
<td class="tblQmlPropNode"><p>
<a name="angle-prop"></a><span class="name">angle</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The angle to rotate, in degrees clockwise.</p>
</div></div><!-- @@@angle -->
<br/>
<!-- $$$axis -->
<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="even" id="axis-prop"><th class="centerAlign"><p><a name="axis-prop"></a><b>axis group</b></p></th></tr><tr valign="top" class="odd" id="axis.x-prop"><td class="tblQmlPropNode"><p><a name="axis.x-prop"></a><span class="name">axis.x</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr><tr valign="top" class="odd" id="axis.y-prop"><td class="tblQmlPropNode"><p><a name="axis.y-prop"></a><span class="name">axis.y</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr><tr valign="top" class="odd" id="axis.z-prop"><td class="tblQmlPropNode"><p><a name="axis.z-prop"></a><span class="name">axis.z</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr></table></div></div><div class="qmldoc"><p>The axis to rotate around. For simple (2D) rotation around a point, you do not need to specify an axis, as the default axis is the z axis (<code>axis { x: 0; y: 0; z: 1 }</code>).</p>
<p>For a typical 3D-like rotation you will usually specify both the origin and the axis.</p>
<p class="centerAlign"><img src="images/3d-rotation-axis.png" alt="" /></p></div></div><!-- @@@axis -->
<br/>
<!-- $$$origin -->
<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="even" id="origin-prop"><th class="centerAlign"><p><a name="origin-prop"></a><b>origin group</b></p></th></tr><tr valign="top" class="odd" id="origin.x-prop"><td class="tblQmlPropNode"><p><a name="origin.x-prop"></a><span class="name">origin.x</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr><tr valign="top" class="odd" id="origin.y-prop"><td class="tblQmlPropNode"><p><a name="origin.y-prop"></a><span class="name">origin.y</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr></table></div></div><div class="qmldoc"><p>The origin point of the rotation (i.e&#x2e;, the point that stays fixed relative to the parent as the rest of the item rotates). By default the origin is (0, 0).</p>
</div></div><!-- @@@origin -->
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